4. Go to the Federal Reserve Economic Database (FRED) website (https://fred.stlouisfed.org) and look up annual data for Gross Domestic Product (GDP) for Singapore (MKTGDPSGA646NWDB) and Vietnam (MKTGDPVNA646NWDB) during the period 1985-01-01 to 2018-01-01. These measures are calculated in current U.S. Dollars and are not seasonally adjusted. Overlay the GDP data for both coun- tries in the same graph and include it as part of your submission. Look up annual data for Investment as a share of GDP for Singapore (KIPPPGSGA156NUPN) and Vietnam (CIPPPGVNA156NUPN) during the period 1970-01-01 to 2010-01-01. Overlay the investment data for both countries in the same graph and include it as part of your submission. a. Based on the graphs you constructed, which country has higher GDP? What accounts for the differences in the growth of GDP between Vietnam and Singapore based on the theory of economic growth